You're reading it wrong. It's
וכן למר / and also for Mar.
When you wished the Bam community a good Adar, Isaac noted that Mar also deserved a good Adar. After all, he was an important part of the entire Purim story. He's the one who originally (Gitin 62 amud 2) said Haman deserved no honor:
אמר מר נוטל הימנה כדי / Mar said Haman gets nothing;
in fact, when everyone else was bowing to Haman, he (Kidushin 33 amud 1) stood erect:
אמר מר יכול יעמוד מפניו / Mar said it's possible to stand before him.
Later, when Haman was to lead Mordechai around on a horse, it was Mar who (Avoda Zara 29 amud 1) suggested that Haman first cut Mordechai 's hair:
אמר מר ישראל המסתפר מעובד כוכבים / Mar said a Jew should get a haircut from a gentile.
He was there at Esther's party to (Z'vachim 116 amud 2) expose Haman:
אמר מר ועובדי כוכבים בזמן הזה רשאין / Mar said idolators nowadays are evildoers.
When Achashverosh heard that, he left the party for a turn in the garden, but Mar was still there (Horayos 13 amud 2) when Achashverosh returned:
אמר מר יצא לצורך נכנס ויושב במקומו / Mar said, he left for a purpose and entered; let him sit in his place,
upon which (Bava Kama 13 amud 2) Mar suggested getting rid of Haman:
אמר מר כשהזיק חב המזיק / Mar said the one who damages is liable to be damaged,
and (Z'vachim 116 amud 2) announced Haman's death:
אמר מר אין לך כל שר ונגיד / Mar said you have no minister or officer.
After that, he was instrumental in setting up Purim as a holiday. He's the one who suggested (Rosh Hashana 20 amud 2) reading the m'gila twice:
אמר מר צריך שיהא לילה ויום / Mar said it must be done night and day;
he's the one who suggested (Bava M'tzia 23 amud 2) how we should celebrate on Purim:
אמר מר חביות של יין / Mar said, barrels of wine!
and he's even the one who (Chagiga 4 amud 1) instituted the practice of having a second reading of "Zachor" for women:
אמר מר זכור להוציא את הנשים/ Mar said "Zachor" to exempt the women.
Of course he deserves a happy Adar!